Concept explainers
(a)
Interpretation:
The most important Lewis structures of ring molecule below have to be drawn and non- zero formal charges and lone pairs have to be shown along with any possible resonance structures.
Concept Introduction:
Lewis structures represent covalent bonds and describe valence electrons configuration of atoms. The covalent bonds are depicted by lines and unshared electron pairs by pairs of dots. The sequence to write Lewis structure of some molecule is given as follows:
- The central atom is identified and various other atoms are arranged around it. This central atom so chosen is often the least electronegative.
- Total valence electrons are estimated for each atom.
- single bond is first placed between each atom pair.
- The electrons left can be allocated as unshared electron pairs or as multiple bonds around the
symbol of the element to satisfy the octet (or duplet) for each atom. - Add charge on the overall structure in case of polyatomic cation or anion.
The formal charge on each atom in the Lewis structure can be calculated from the equation written as follows:
Here,
(b)
Interpretation:
The most important Lewis structures of below ring molecule have to be drawn and non- zero formal charges and lone pairs have to be shown along with any possible resonance structures.
Concept Introduction:
Refer to part (a).
(c)
Interpretation:
The most important Lewis structures of below ring molecule has to be drawn and non- zero formal charges and lone pairs have to be shown along with any possible resonance structures.
Concept Introduction:
Refer to part (a).
(d)
Interpretation:
The most important Lewis structures of ring molecules have to be drawn and non- zero formal charges and lone pairs have to be shown along with any possible resonance structures.
Concept Introduction:
Refer to part (a).
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Chemical Principles: The Quest for Insight
- Write Lewis structures for these ions. Show all valence electrons and all formal charges. (a) Amide ion, NH2 (b) Bicarbonate ion, HCO3 (c) Carbonate ion, CO32 (d) Nitrate ion, NO3 (e) Formate ion, HCOO (f) Acetate ion, CH3COOarrow_forwardConsider the pyrosulfate ion, S2O72-. It has no sulfur–sulfur nor oxygen–oxygen bonds. (a) Write a Lewis structure for the pyrosulfate ion using only single bonds. (b) What is the formal charge on the sulfur atoms for the Lewis structure you drew in part (a)? (c) Write another Lewis structure using six bonds and two O—S bonds. (d) What is the formal charge on each atom for the structure you drew in part (c)?arrow_forwardWrite all possible resonance structures for the following species. Assign a formal charge to each atom. In each case, which resonance structure is the most important? (a) NO2 (nitrogen is central) (b) ClCNarrow_forward
- Formamide, HC(O)NH2, is prepared at high pressures from carbon monoxide and ammonia, and serves as an industrial solvent (the parentheses around the O indicate that it is bonded only to the carbon atom and that the carbon atom is also bonded to the H and the N atoms). Two resonance forms (one with formal charges) can be written for formamide. Write both resonance structures, and predict the bond angles about the carbon and nitrogen atoms for each resonance form. Are they the same? Describe how the experimental determination of the HNH bond angle could be used to indicate which resonance form is more important.arrow_forwardDraw three resonance structures for N3-. This species has its three atoms bonded sequentially in the following fashion: N-N-N. Draw your resonance structures so that the atoms in them are bonded together in this order. Select the most important resonance structure for this species based on the formal charges on the atoms of the three resonance structures you have drawn. Now select the statement from the multiple choices which is true about this most important resonance structure.In the most important resonance structure of N3- : a) The leftmost bond (between N and N) is a single bond.b) The rightmost bond (between N and N) is a single bond.c) The formal charge on the leftmost (N) atom is -1.d) The number of nonbonding pairs (lone pairs) of electrons on the leftmost (N) atom is 4.e) The number of nonbonding (lone) pairs of electrons on the rightmost (N) atom is 4.arrow_forwardDraw the most plausible resonance structure for the cyanate ion, OCN− . Be sure to include all lone pair electrons and nonzero formal charges.arrow_forward
- Draw out the Lewis structures for H₂CO3, HCO3, and CO32-. Then determine the maximum number of equivalent resonance structures for each species. Note that carbon is the central atom in all three cases. If the molecule contains hydrogen atoms they are attached to oxygen atoms. Only count the best structures. For example, A structure with really bad formal charges should not be counted. The molecule H₂CO3 has The molecule HCO3 has The molecule CO3²- has equivalent Lewis structures. equivalent Lewis structures. equivalent Lewis structures.arrow_forwardAn incomplete Lewis structure is shown below. The structure only shows the atoms and how they are connected. The molecule has a net charge of +1. Complete the Lewis structure giving all atoms full octets. If there is more than one way to do this, draw resonance structures showing all possibilities. If not, just draw one Lewis structure. Be sure to write in any non-zero formal charges.arrow_forwardConsider the incomplete structure shown. Draw an alternative Lewis (resonance) structure for the incomplete structure. Show the unshared electron pairs and nonzero formal charges in your structure. Don't use radicals. Determine the formal charge on the nitrogen atom in the structure. If the atom is formally neutral, indicate a charge of zero.arrow_forward
- Draw two different Lewis structures for ClO3-, one which all atoms follow the octet rule and one where the chlorine has an expanded octet. Determine the formal charge on all atoms for each structure. Which do you think is the better Lewis structure? Explain your reasoning.arrow_forwardShown here is a Lewis structure for the chlorite ion, ClO2–, that obeys the octet rule, showing all non-zero formal charges. How many resonance structures for ClO2– that obey the octet are possible? Note: Options 2 and 3 are marked wrongarrow_forwardDraw the three resonance structures for (a) the cyanate ion (NCO−) and (b) the isocyanate ion (CNO−). In each case, rank the resonance structures in order of increasing importance. Be sure to include all lone pair electrons and nonzero formal charges.a) NCO−arrow_forward
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